<template>
  <div class="com-container" @dblclick="revertMap">
    <div class="com-chart" ref="map_ref"></div>
  </div>
</template>

<script>
import axios from "axios";
import { mapState } from 'vuex'
import { getProvinceMapInfo } from "../utils/map_utils";
// import Map  from '../../public/static/map/china.json'
export default {
  name: "Map",
  data() {
    return {
      chartInstance: null,
      allData: [],
      mapData: {},
    };
  },
  mounted() {
    this.initChart();
    this.getData();
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
  },
  methods: {
    async initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.map_ref, this.theme);
      const ret = await axios.get(
        "http://localhost:8999/static/map/china.json"
      );
      this.$echarts.registerMap("china", ret.data);
      const initOptions = {
        title: {
          text: "┃ 商家分布",
          left: 20,
          top: 20,
        },
        geo: {
          type: "map",
          map: "china",
          top: "5%",
          bottom: "5%",
          itemStyle: {
            areaColor: "#2E72BF",
            borderColor: "#333",
          },
        },
        legend: {
          left: "5%",
          bottom: "5%",
          orient: "vertical",
        },
      };
      this.chartInstance.setOption(initOptions);
      this.chartInstance.on("click", async (arg) => {
        const proviceInfo = getProvinceMapInfo(arg.name);
        //获取这个地图省份的地图矢量数据
        //判断当前所点击的这个省份矢量数据在mapdata中也没有保存
        if (!this.mapData[proviceInfo.key]) {
          const ret = await axios.get(
            "http://localhost:8999" + proviceInfo.path
          );
          this.mapData[proviceInfo.key] = ret.data;
          this.$echarts.registerMap(proviceInfo.key, ret.data);
        }
        const changeOption = {
          geo: {
            map: proviceInfo.key,
          },
        };
        this.chartInstance.setOption(changeOption);
      });
    },
    async getData() {
      const { data: ret } = await this.$axios.get("map");
      this.allData = ret;
      this.updateChart();
    },
    updateChart() {
      //处理图表所需要的数据
      //图例的数据
      const legendArr = this.allData.map((item) => {
        return item.name;
      });
      const seriesArr = this.allData.map((item) => {
        return {
          //一个类别下的所有散点
          type: "effectScatter",
          rippleEffect: {
            scale: 5,
            brushType: "stroke",
          },
          name: item.name,
          data: item.children,
          coordinateSystem: "geo",
        };
      });
      // 处理数据
      const dataOption = {
        legend: {
          data: legendArr,
        },
        series: seriesArr,
      };

      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      const titleFontSize = (this.$refs.map_ref.offsetWidth / 100) * 3.6;
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize,
          },
        },
        legend: {
          itemWidth: titleFontSize / 2,
          itemHeight: titleFontSize / 2,
          itemGap: titleFontSize / 2,
          textStyle: {
            fontSize: titleFontSize / 2,
          },
        },
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    //双击回到中国地图
    revertMap() {
      const revertOption = {
        geo: {
          map: "china",
        },
      };
      this.chartInstance.setOption(revertOption);
    },
  },
   computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme () {
      console.log('主题切换了')
      this.chartInstance.dispose() // 销毁当前的图表
      this.initChart() // 重新以最新的主题名称初始化图表对象
      this.screenAdapter() // 完成屏幕的适配
      this.updateChart() // 更新图表的展示
    }
  }
};
</script>

<style>
</style>